package com.rtx.config.mybatis;


import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import java.util.regex.Matcher;

import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.CollectionUtils;


@Intercepts({
       @Signature(type = Executor.class, method = "update", args = {
               MappedStatement.class, Object.class}),
       @Signature(type = Executor.class, method = "query", args = {
               MappedStatement.class, Object.class, RowBounds.class,
               ResultHandler.class})})
public class FullSQLInterceptor implements Interceptor {

   static final Logger logger = LoggerFactory.getLogger(FullSQLInterceptor.class);

   @Override
   public Object intercept(Invocation invocation) throws Throwable {
       try {
           // 获取xml中的一个select/update/insert/delete节点，主要描述的是一条SQL语句
           MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
           Object parameter = null;
           // 获取参数，if语句成立，表示sql语句有参数，参数格式是map形式
           if (invocation.getArgs().length > 1) {
               parameter = invocation.getArgs()[1];
               logger.info("sql param:{}",parameter);
           }
          /* if (SqlCommandType.SELECT.equals(mappedStatement.getSqlCommandType())) {
           }*/
           // 获取到节点的id,即sql语句的id
           String sqlId = mappedStatement.getId();
           // BoundSql就是封装myBatis最终产生的sql类
           BoundSql boundSql = mappedStatement.getBoundSql(parameter);
           // 获取节点的配置
           Configuration configuration = mappedStatement.getConfiguration();
           // 获取到最终的sql语句
           String sql = getSql(configuration, boundSql, sqlId);
           logger.info("sql->{}", sql);
       } catch (Exception e) {
           // log.error(e.getMessage(), e);
       }
       // 执行完上面的任务后，不改变原有的sql执行过程
       return invocation.proceed();
   }

   /**
    * 封装了一下sql语句，使得结果返回完整xml路径下的sql语句节点id + sql语句
    *
    * @param configuration configuration
    * @param boundSql      boundSql
    * @param sqlId         sqlId
    * @return java.lang.String
    * @author wz
    * @date 2021/4/7 20:43
    */
   public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId) {
       String sql = showSql(configuration, boundSql);
       StringBuilder str = new StringBuilder(100);
       str.append(sqlId);
       str.append(":");
       str.append(sql);
       return str.toString();
   }

   /**
    * 如果参数是String，则添加单引号， 如果是日期，则转换为时间格式器并加单引号；
    * 对参数是null和不是null的情况作了处理
    *
    * @param obj obj
    * @return java.lang.String
    * @author wz
    * @date 2021/4/7 20:43
    */
   private static String getParameterValue(Object obj) {
       String value = null;
       if (obj instanceof String) {
           value = "'" + obj.toString() + "'";
       } else if (obj instanceof Date) {
           DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
           value = "'" + formatter.format(new Date()) + "'";
       } else {
           if (obj != null) {
               value = obj.toString();
           } else {
               value = "";
           }

       }
       return value;
   }

   // 进行？的替换
   public static String showSql(Configuration configuration, BoundSql boundSql) {
       Object parameterObject = boundSql.getParameterObject();  // 获取参数
       List<ParameterMapping> parameterMappings = boundSql
               .getParameterMappings();
       String sql = boundSql.getSql().replaceAll("[\\s]+", " ");  // sql语句中多个空格都用一个空格代替
       if (!CollectionUtils.isEmpty(parameterMappings) && parameterObject != null) {
           TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry(); // 获取类型处理器注册器，类型处理器的功能是进行java类型和数据库类型的转换<br>// 如果根据parameterObject.getClass(）可以找到对应的类型，则替换
           if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
               sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(parameterObject)));

           } else {
               MetaObject metaObject = configuration.newMetaObject(parameterObject);// MetaObject主要是封装了originalObject对象，提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作
               for (ParameterMapping parameterMapping : parameterMappings) {
                   String propertyName = parameterMapping.getProperty();
                   if (metaObject.hasGetter(propertyName)) {
                       Object obj = metaObject.getValue(propertyName);
                       sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
                   } else if (boundSql.hasAdditionalParameter(propertyName)) {
                       Object obj = boundSql.getAdditionalParameter(propertyName);  // 该分支是动态sql
                       sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
                   } else {
                       sql = sql.replaceFirst("\\?", "缺失");
                   }//打印出缺失，提醒该参数缺失并防止错位
               }
           }
       }
       return sql;
   }

   @Override
   public Object plugin(Object target) {
       return Plugin.wrap(target, this);
   }

   @Override
   public void setProperties(Properties properties) {

   }
}
